[jdk16] RFR: 8260473: [vector] ZGC: VectorReshape test produces incorrect results with ZGC enabled

[Vladimir Ivanov]

On Sun, 31 Jan 2021 00:41:11 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> compileonly and compilercount=1 will let the VM run slow enough to wait for a gc to be finished.

That's a strange way to provoke the bug. You could just increase the number of iterations instead.

But the right way to fix it is to stress ZGC to continuously run in the background while the test case aggressively unboxes vectors in compiled code. `-Xmx256m` helps with that while `-XX:CICompilerCount=1` is irrelevant.

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PR: https://git.openjdk.java.net/jdk16/pull/139